I have multiple interesting buffers in my jumplist, but I would like to view two of them side-by-side. How would you do that? That's the general case of this question.
In my particular case, it is because I have a split next to my file with vim-fugitive, showing diffs of a commit. I want to keep that fugitive buffer open, but change the left split to view the file of a diff fugitive is showing me. So, I can press Enter on a change in fugitive, and it will go to that file (in the git-index), and then I can press C-O to jump back; but now I need to open the next/previous item on the jump list in the other split. Is that possible?